Specifications:

Model: 25mm-F1.8
Full frame available: no available for full frame, only for APS-C fisheye lens
Aperture range: F1.8-16
Closest focus distance: 0.18m
Blades Number: 12 diaphragm blades
Construction: 7 elements in 5 groups
Filter Diameter: 46mm
Lens Length: 32mm
Weight: 143g